* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #edf1f4;
  min-height: 100vh;
}
.loader {
  display: flex;
  flex-direction: row;
}
.loader div {
  position: relative;
  width: 40px;
  height: 200px;
  margin: 20px;
  border-radius: 40px;
  overflow: hidden;
  border: 2px solid #edf1f4;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.05));
  box-shadow: 15px 15px 20px rgba(99, 68, 68, 0.1), -15px -15px 20px #fff,
    inset -5px -5px 5px rgba(255, 255, 255, 0.5),
    inset 5px 5px 5px rgba(0, 0, 0, 0.05);
}
.loader div::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  border-radius: 40px;
  box-shadow: 15px 15px 20px rgba(99, 68, 68, 0.1), -15px -15px 20px #fff,
    inset -5px -5px 5px rgba(255, 255, 255, 0.5),
    inset 5px 5px 5px rgba(0, 0, 0, 0.05);
}
.loader div::after {
  position: absolute;
  content: "";
  top: 0;
  left: 0;
  width: 36px;
  height: 36px;
  background: #fff;
  border-radius: 50%;
  box-shadow: inset -5px -5px 5px rgba(0, 0, 0, 0.2), 0 420px 0 400px #2196f3;
  animation: animation 2.5s ease-in-out infinite;
  transform: translateY(160px);
  animation-delay: calc(-0.5s * var(--i));
}
@keyframes animation {
  0% {
    transform: translateY(160px);
    filter: hue-rotate(180deg);
  }
  50% {
    transform: translateY(0px);
  }
  100% {
    transform: translateY(160px);
    filter: hue-rotate(0deg);
  }
}
